used to describe someone mentally challenged, or to describe them as stupid or dumb after committing an action not soundly carried out or speaking in a dumb manner. mostly a temporary nickname for people, 'bip' can sometimes become permanent if the person continues to act in a stupid way.

Tom- yo shawn you get deeds from that girl?
Shawn- Nah
Everyone- BURRRRRR!!!!!Shawn- How am i a bip?